EP 2141251 B1 20161228 - Shape memory alloys based on iron, manganese and silicon
Title (en)
Shape memory alloys based on iron, manganese and silicon
Title (de)
Auf Eisen, Mangan und Silizium basierende Formgedächtnislegierungen
Title (fr)
Alliages à mémoire de forme à base de fer, de manganèse et de silicium
Publication
Application
Priority
CH 9682008 A 20080625
Abstract (en)
[origin: EP2141251A1] Shape memory alloy comprises a base alloy of manganese, silicon, chromium and nickel and a residual mass fraction of iron, a mass fraction of at least 0.2 wt.% of vanadium and a specifically injected mass portion of at least 0.2 wt.% of carbon and/or nitrogen in the form of precipitated vanadium carbide precipitates and/or vanadium nitride precipitates. Independent claims are included for: (1) the use of a shape-memory alloy in civil engineering, preferably for the constriction of supports, internally prestressed cement-bound workpieces or to create improved anchoring elements, where the shape-memory alloy exhibits austenite transition temperature area with a width of less than 80[deg] C, preferably at least 40[deg] C; and (2) a process for producing a shape memory alloy, comprising melting manganese, silicon, chromium, nickel, and a mass fraction of iron, according to a subsequent addition of a mass fraction of vanadium takes place, after which a targeted addition of a mass fraction of carbon takes place and these solid shape-memory alloy is treated by a solution treatment at 1050-1150[deg] C for 5-10 hours, where a heat aging for 1-2 hours at a temperature of 650-900[deg] C is carried out to form vanadium carbide precipitates in the shape memory alloy.
IPC 8 full level
C21D 6/00 (2006.01); C21D 6/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/46 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP)
C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 6/02 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/46 (2013.01); C22C 38/58 (2013.01); C21D 2201/01 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 09162774 A 20090616